+
+void smpi_sample_3(int global, const char *file, int line)
+{
+ char *loc = sample_location(global, file, line);
+ local_data_t *data;
+
+ xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
+ data = xbt_dict_get(samples, loc);
+ XBT_DEBUG("sample3 %s",loc);
+ xbt_free(loc);
+
+ if (data->benching==0) {
+ THROW_IMPOSSIBLE;
+ }
+
+ // ok, benchmarking this loop is over
+ xbt_os_threadtimer_stop(smpi_process_timer());
+
+ // update the stats
+ double sample, n;
+ data->count++;
+ sample = xbt_os_timer_elapsed(smpi_process_timer());
+ data->sum += sample;
+ data->sum_pow2 += sample * sample;
+ n = (double)data->count;
+ data->mean = data->sum / n;
+ data->relstderr = sqrt((data->sum_pow2 / n - data->mean * data->mean) / n) / data->mean;
+ if (!sample_enough_benchs(data)) {
+ data->mean = sample; // Still in benching process; We want sample_2 to simulate the exact time of this loop occurrence before leaving, not the mean over the history
+ }
+ XBT_DEBUG("Average mean after %d steps is %f, relative standard error is %f (sample was %f)", data->count,
+ data->mean, data->relstderr, sample);
+
+ // That's enough for now, prevent sample_2 to run the same code over and over
+ data->benching = 0;
+}
+
+#ifndef WIN32
+void *smpi_shared_malloc(size_t size, const char *file, int line)
+{
+ char *loc = bprintf("%zu_%s_%d", (size_t)getpid(), file, line);
+ size_t len = strlen(loc);
+ size_t i;
+ int fd;
+ void* mem;
+ shared_data_t *data;
+ if (sg_cfg_get_boolean("smpi/use_shared_malloc")){
+ for(i = 0; i < len; i++) {
+ /* Make the 'loc' ID be a flat filename */
+ if(loc[i] == '/') {
+ loc[i] = '_';
+ }
+ }
+ if (!allocs) {
+ allocs = xbt_dict_new_homogeneous(free);
+ }
+ data = xbt_dict_get_or_null(allocs, loc);
+ if(!data) {
+ fd = shm_open(loc, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+ if(fd < 0) {
+ switch(errno) {
+ case EEXIST:
+ xbt_die("Please cleanup /dev/shm/%s", loc);
+ default:
+ xbt_die("An unhandled error occured while opening %s: %s", loc, strerror(errno));
+ }
+ }
+ data = xbt_new(shared_data_t, 1);
+ data->fd = fd;
+ data->count = 1;
+ data->loc = loc;
+ mem = shm_map(fd, size, data);
+ if(shm_unlink(loc) < 0) {
+ XBT_WARN("Could not early unlink %s: %s", loc, strerror(errno));
+ }
+ xbt_dict_set(allocs, loc, data, NULL);
+ XBT_DEBUG("Mapping %s at %p through %d", loc, mem, fd);
+ } else {
+ mem = shm_map(data->fd, size, data);
+ data->count++;
+ }
+ XBT_DEBUG("Shared malloc %zu in %p (metadata at %p)", size, mem, data);
+ }else{
+ mem = xbt_malloc(size);
+ XBT_DEBUG("Classic malloc %zu in %p", size, mem);
+ }
+
+ return mem;
+}
+void smpi_shared_free(void *ptr)
+{
+ char loc[PTR_STRLEN];
+ shared_metadata_t* meta;
+ shared_data_t* data;
+ if (sg_cfg_get_boolean("smpi/use_shared_malloc")){
+
+ if (!allocs) {
+ XBT_WARN("Cannot free: nothing was allocated");
+ return;
+ }
+ if(!allocs_metadata) {
+ XBT_WARN("Cannot free: no metadata was allocated");
+ }
+ snprintf(loc, PTR_STRLEN, "%p", ptr);
+ meta = (shared_metadata_t*)xbt_dict_get_or_null(allocs_metadata, loc);
+ if (!meta) {
+ XBT_WARN("Cannot free: %p was not shared-allocated by SMPI", ptr);
+ return;
+ }
+ data = meta->data;
+ if(!data) {
+ XBT_WARN("Cannot free: something is broken in the metadata link");
+ return;
+ }
+ if(munmap(ptr, meta->size) < 0) {
+ XBT_WARN("Unmapping of fd %d failed: %s", data->fd, strerror(errno));
+ }
+ data->count--;
+ XBT_DEBUG("Shared free - no removal - of %p, count = %d", ptr, data->count);
+ if (data->count <= 0) {
+ close(data->fd);
+ xbt_dict_remove(allocs, data->loc);
+ free(data->loc);
+ XBT_DEBUG("Shared free - with removal - of %p", ptr);
+ }
+ }else{
+ XBT_DEBUG("Classic free of %p", ptr);
+ xbt_free(ptr);
+ }